Furnace



(No Model.) I

- J.MORAN-.

' FURNACE.

' No. 551,133. Patented 1min L/awzes e UNITED STATES PATENT OFFICE.

JAMES MORAN, OF ORANGE, TEXAS.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 551,133, dated.December 10, 1895.

Application filed May 23, 1895. Serial No.550,385. (No model.)

To all whom it may concern:

Be it known that 1, JAMES MORAN, a citizen of the United States,residing at Orange, in the county of Orange and State of Texas, haveinvented a new and useful Furnace, of which the following is aspecification.

This invention relates to an improvement in back plates for flue andtubular boilers of any description.

The object of the present invention is to provide a novel constructionof back plate to be used in connection with boilers and the furnacesthereof, in lieu of the usual brick arch arranged at the rear of theboiler for directing the flame and products of combustion through thetubes or flues of said boiler.

To this end the invention consists in a metallic back plate forboiler-furnaces comprising several flanged sections, bolted or otherwisesecured together and havingstrips of asbestos inserted between thejoints of said sections; in providing each section with a slotted boss,adapting the same to receive a headed supporting bolt; also in certainnovel features and details of construction and arrangement, ashereinafter fully described, illustrated in the drawings, and finallyembodied in the claims.

In the accompanying drawings, Figure 1 is a perspective view of animproved back plate for boiler-furnaces constructed in accordance withthis invention. Fig. 2 is a side or edge elevation of the same shownapplied to the rear end of a boiler, showing also one of the bolts bymeans of which the plate is supported from above.

Similar numerals of reference designate corresponding parts in bothfigures of the drawlngs.

Referring to the accompanying drawings, the improved back plate, whichis best illustrated in Fig. 1, is composed of three similar sections 1.It will be apparent that these sections may be fewer or greater innumber, as desired or as required by the size of the boiler and furnaceor other conditions. Said sections in cross-sectional shape resemble theusual brick arch used in connection with boilers for directing the flameand products of combustion through the tubes or flues of said boilerfrom the rear.

The sections 1 are provided at their adjacent meeting edges with flanges2, extending outwardly or from the upper faces thereof, as shown, andthe sections are firmly united by passing suitable rivets or boltsthrough said flanges. At the joints between the flanges 2, at themeeting edges of the sections 1, are located packing-strips 3 ofasbestos, the object of which is to afford a flexible joint, allowingfor expansion and contraction, which will effectually prevent warpingand the consequent breaking of the plate as a whole. The lower portionsof the sections 1 and also the flanges 2 are extended rearwardly in ahorizontal direction to form a base 4, which is adapted to rest upon andbe secured to the top of the rear wall of the furnace, as shown in Fig.2.

At or near the upper inner end of each section the latter is providedwith an integrallyformed boss or lug 5, which is formed with an openslot 6 at its top and recessed beneath said slot, as indicated at 7, toprovide for the insertion and removal of a T-headed supporting-bolt 8.The bolt 8 may be of any usual or preferred form, being shown providedwith an eye 9, facilitating the engagement thereof with a rod or supportlocated above the back plate. By means of the construction abovedescribed an efiective construction of back plate is obtained, which isadapted to deflect the flame and products of combustion and direct thesame into and through the tubes or flues of a steam-boiler. By reason ofthe absence of the usual bricks, which are usually employed either aloneor in connection with metallic supports, the outer surface of said plateis exposed to the air, the effect of which willbe to greatlyincrease thelife of said back plate. By reason of the asbestos packing between thejoints of the several sections of the back plate an elastic or flexiblejoint is formed, which will allow the back plate to expand or contract,thus obviating the warping and breaking thereof. The particular form offlanges at the meeting edges of the back-plate sections also has adecided advantage over the ordinary lap-joint, which by expansion andcontraction is liable to open and separate or get out of shape, so thatthe plate is rendered unfit for further use, allowing the heat, flame,&c., to pass through the openings therein. By means of the recessed andslotted bosses on each section it will be seen that each section isindependently supportedand that the heads of the supporting-bolts may bereadily disengaged from said bosses when it is desired to remove oradjust the back plate.

Changes in the form, proportion, and minor details of construction maybe resorted to without departing from the'spirit or sacrificing any ofthe advantages of this invention.

Having thus described the invention, what is claimed as new, and desiredto be secured by Letters Patent, is-

1. A back-plate for steam boiler furnaces, the same comprising severalsections separately formed and provided at their meeting edges withangular flanges, a suitable packing of asbestos interposed between saidflanges, and suitable fastening devices for firmly uniting said flanges,substantially as described.

2. In aback-plate for steam boiler furnaces, a series of arched metalplates similarly shaped in cross section and formed at their meetingedges with integral angular flanges, whereby said sections areconnected, and an integrally formed recessed and slotted boss or lug foreach section, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

JAMES MORAN. \Vitnesses J. T. ADAMS, A. MO AN.

